what does it mean when my Ford F-150 displays a P0302 code

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel pressure gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Remove the engine cover if applicable.
• Remove the spark plug from cylinder 2 using a spark plug socket.
  • Safety Warning: Ensure the engine is cool to avoid burns.
• Inspect the spark plug for wear or carbon buildup; replace if necessary.
• Test the ignition coil for cylinder 2 with a multimeter; replace if it is outside the manufacturer's specifications.
• Reinstall the new spark plug and coil, ensuring they are properly torqued to the manufacturer's specifications (usually around 12-15 ft-lbs).

3. Examine Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to test the injector's resistance; replace the injector if it is out of the manufacturer’s range.
• If the injector is functional, clean it with a suitable injector cleaner or replace it as needed.
• Reconnect the injector and ensure all connections are secure.

4. Compression Test

• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it with the manufacturer's specifications (typically around 120-180 psi).
• If readings are low, further investigation into mechanical issues like valve damage or head gasket failure is required.

5. Check for Vacuum Leaks

• Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks while the engine is running. Repair any leaks found.